@425, the live version of Tarkus really is all about the final section, Aquatarkus. To me, the improv section, which is completely different from the studio version, is the greatest moment in their catalog. They do such an amazing, impeccable job of building that section up, so that when it gets back to the reprise of the opening section of the piece, it feels like such an incredible release. ELP had few equals when it came to live performance.